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qemu-timer: Check for usable fields for SIGEV_THREAD_ID 

Older glibc (RHEL 5.x, Debian 5.x) does not have the _sigev_un._tid
member in its structure definition, while the accompanying kernel
headers do define SIGEV_THREAD_ID.  We need configure to check for
both before using it.

Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Richard Henderson 2012-10-23 07:33:00 +10:00 committed by Aurelien Jarno
parent 44b37ace06
commit 1e9737da4a
2 changed files with 24 additions and 2 deletions
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22
configure vendored
View File

@ -2812,6 +2812,24 @@ if compile_prog "" "" ; then
posix_madvise=yes
fi
##########################################
# check if we have usable SIGEV_THREAD_ID
sigev_thread_id=no
cat > $TMPC << EOF
#include <signal.h>
int main(void) {
struct sigevent ev;
ev.sigev_notify = SIGEV_THREAD_ID;
ev._sigev_un._tid = 0;
asm volatile("" : : "g"(&ev));
return 0;
}
EOF
if compile_prog "" "" ; then
sigev_thread_id=yes
fi
##########################################
# check if trace backend exists
@ -3159,6 +3177,7 @@ echo "preadv support $preadv"
echo "fdatasync $fdatasync"
echo "madvise $madvise"
echo "posix_madvise $posix_madvise"
echo "sigev_thread_id $sigev_thread_id"
echo "uuid support $uuid"
echo "libcap-ng support $cap_ng"
echo "vhost-net support $vhost_net"
@ -3443,6 +3462,9 @@ fi
if test "$posix_madvise" = "yes" ; then
echo "CONFIG_POSIX_MADVISE=y" >> $config_host_mak
fi
if test "$sigev_thread_id" = "yes" ; then
echo "CONFIG_SIGEV_THREAD_ID=y" >> $config_host_mak
fi
if test "$spice" = "yes" ; then
echo "CONFIG_SPICE=y" >> $config_host_mak

4
qemu-timer.c
View File

@ -494,12 +494,12 @@ static int dynticks_start_timer(struct qemu_alarm_timer *t)
memset(&ev, 0, sizeof(ev));
ev.sigev_value.sival_int = 0;
ev.sigev_notify = SIGEV_SIGNAL;
#ifdef SIGEV_THREAD_ID
#ifdef CONFIG_SIGEV_THREAD_ID
if (qemu_signalfd_available()) {
ev.sigev_notify = SIGEV_THREAD_ID;
ev._sigev_un._tid = qemu_get_thread_id();
}
#endif /* SIGEV_THREAD_ID */
#endif /* CONFIG_SIGEV_THREAD_ID */
ev.sigev_signo = SIGALRM;
if (timer_create(CLOCK_REALTIME, &ev, &host_timer)) {